Drill.



G. A. HUMASON.

DRILL.

APPLICATION FILED APR.7, 1913.

1 1 20, 1 98, Patented Dec. 8, 1914.

2 SHEETS-SHEET 1.

r .l Q Attorneys G. A. HUMASON.

DRILL.

APPLICATION FILED APR?, 1913.

1, 1 20, 1 98. Patented Deo. 8, 1914.

2 SHEETS-SHEET 2.

-ITED STATES PA TENT OFFTCE.

u Gl'RANVIIILEY A. HUMASON, OF SHREVEPORT, LOUISIANA, ASSIGNOR T0 GEORGE W.

' ROBINSON, OF SHREVEPORT,.LOUISIANA.

DRILL Application filed April 7, 1913. Serial No. 759,524.

To all 'whom it may concern Be it known that I, GRANVILLE SON, a citizen of the United States, residing at Shreveport, in the parish of Caddo and-State of Louisiana, have invented a new and useful Drill, of which the followingwis ya specification.

' `his invention relates to drills particularly designed for use in cutting through gumbo and like substances, the invention being more particularly an improvement upon the structure disclosed in an application'liled by me on February 10, 1913, said application bearing Serial No. 747,461.

One of the objects of the invention is to provide the drill with plowing or digging means of novel form which, during the rotation ofthe drill, will plow into the substance to be removed, thereby loosening it so that it Iwill be carried oft' by a current of water directed onto said cutting means.

A further object is to provide a drill head so shaped asv to permit water and all substances mixed therewith,\to flow freely out of the bore without danger of clogging. l With the foregoing and other objects in view which will appearI as the description proceeds, the invention resides in the combination and arrangement'of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made Within the scop'e of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings, the preferred forms of the invention have been shown.

In said drawings Figure 1 is a view partly in section and partly in elevation of a. drill having the present limprovements combined therewith. Fig. 2 is another View partly in 'section and partly in elevation of the drill, that ortion thereof in section being taken on t e line A-B Fig. 1. Fig. 3 is a section on line C-D Fig. 2. Fig. 4 is an elevation of the lower end of the drill. Fig. 5 is a section on line E-F Fig. 1. Fig. 6 is an enlarged ,section through one of the end cutters. Fig.` 7 is a section through oneof the bushings used in connection with the end cutters. Fig. 8 is a-section through one of the side cutters., Fig. 9 1s alface view of said side `cutter shown 1n Fig'. 8.

Specication of Letters Patent.

A. HUMA- Patented Dec. 8, 1914.

Referring to the figures by characters of reference 1 designates a head having a threaded stem 2, this head being provided, 1n its active end, with a recess 3 extending Adiametrically across said end and between channels 4 which converge inwardly within the head. Grooves or sluices 5 are formed in the outer face of the head and. intersect theends of the channels 4 so that water can thus How freely along the outer side of the head.

A tubular bearing shaft 6 is secured in any suitable manner within the head and extends longitudinally along the center of the recess 3. The ends of this shaft are formed with ducts 7 constantly registering with passages S designed to.convey a lubricant to the interior of the shaft from a bore 9 formed in the head 1 and its stem 2. Additional lubricant passages 10 are formed in the head 1 and extend from bore 9 to bores 11 formed longitudinally within bearing pins 12 which extend across the channels 4, these bearing pins being similar to those disclosed in my application hereinbefore referred to.

A tubular drill rod 13 engages the threaded stem 2 of the head and extends around a tubular lubricant container 14 which engages the stem 2 and opens into the ybore 9. This lubricant container 14 is preferably provided. with a coupling 15 connecting it to a larger tube 16 for containing a lubricant. Thus it will be seen that the coupling 15 forms an interior shoulder constituting means for retarding the movement of. a.

therein, this plug being formed with longitudinal grooves 18 in its periphery forming outlets for the lubricantwithin the container 14 whereby saidglubricant can pass into the bore 9. The container 14 and the tube 16 are adapted to hold a paste-like lubricant and the drill rod 13 is adapted `to hold water being supplied to the cutting elements hereinafter described. A portion' of this water 1s adapted to press on the lubricant within the container` 14-16 so as to cause it to press through the grooves 18 .heat generated from the frictional engage- 'ment of the cutting'devices with the material being cut.

Water ducts 19 are formed in the head l and serve to convey water from the interior of the tubular rod 13'd to the channels et and also to the recess` 3. @ne of these ducts extends to each channel 4 while two additional ducts extend to the 'recess 3, said ducts opening 4into the recess adjacent opposite ends thereof..

Arranged on each bearing pin 12 is a bushing the hub 21 of a concave-convex disk or colter 22, the lower portion of the periphery of which extends outwardly beyond the wall of the head 1. As shown this disk is formedA with a plurality ofradialincisions 23 forming, tongues 24 which can be bent backwardly, as shown particularly in Fig. 8 so that, when the disk rotates, it will cut la.

wider path than would be the case should an ordinary concave-convex disk be used.

However, if desired, jan ordinary concavo-I couver' disk may be used in -lieu of the form illustrated. Such a disk is well known in the art and it is not believed to be necessary to illustrate the same.

' Mounted on the tubular shaft'6 is a series of cutters, one of which has been shown in' detail in Fig. 6. Fach cutter includes a hub 25 haring a counter bore 26 extending thereinto from one end upto a point adjacent. the center oir' the hub. vFrom the other end of the hub' extends a circular flange 27. A concavo-convex body 28 extends from the h ub and has'the appearance of an ordinary colter disk. llhe hub is adapted to; bear upon a bushing ot! peculiar construction and which has been shown in detail in Fig. 7. This'bushing includes an inner cylindrical. portion 29 adapted to fit snugly on the shaft 6. A sleeve .30 extends around a portion ot the tube 29 and is connected vtheretoat one end by a web 31. '1` he recess 32 so formed is so proportioned asv to receive snugly the Harige 27 of one of the hubs 25. An annular flange 33 extends from the free edge of the sleeve 30 and is adapted to extend between hubs of adjacent cutting elements. The counter .bore 26 in each hub is of sullicient size to receive not only a lportion of the tubular portion 29 of the bushin but also the sleeve 30, the web 31, and the ange 29 of the next adjoining hub. r1`his arrangement of parts has been clearly illustrated 1n Fig. 2.

As shown in Fig. I1,the cutting elements mounted on shaft 6 are disposed in twoseries, the elements of one series being dis# posed onpositely to those of the other series and one series containing a greater number of cutting elements Vthan the other so that one series of cutting elements will ertend` across the axis of rotation of the head 1.

ln using the device herein described, the

20. and mounted on the bushing ismedias bore 9 and the container 14-16 are filled with a lubricant in the form of a paste, it being understood of course that the plug 17 is to be seated in the upper end portion of bore 9 as shown. The drill is then lowered against the surface to be cut and water is supplied to the interior of the tubular rod 13 so as to How through the ducts 19 into the channels 4. and recess 3. Ill`hus said channels and the recess will be thoroughly flushed and the water after passing under the drill head `will How upwardly freely through the grooves or sluices 5 and carry therewith all substances which may have been cut out by the drill. As the drill is moved upwardly and downwardly, it is gradually rotated and the disks 28 thus plow into the bottom of the bore and loosen the material lin the paths thereof, this material being washed away as soon as loosened. At the same time the concavo-convex side cutters 22, which are disposed along lines converging 'upwardly, will eut into the side portion of the-bore soas tofmake a bore the diameter of which is greater than that of the head 1. As soon as materialis cutaway by these disks 22, the said material will be ushed out of the bore by the'water supplied thereto in the manner hereinbefore stated. By arranging thecutters as shown, all parts of the bottom of the bore will be reached thereby and no portion of the bottom will be left Standing uncut. The engagement of the cutters and the'head with the material in the bore will soon raise thetemperature of the head so that thelubricant contained within the various ducts will be heated and liqueiied and thus How by gravity .to the `various bearings. Furthermore the water contained within the tubular rod 13 will bear downwardly upon the lubricant within the tube 16 so as to force Athe lubricant downwardly slowly through the grooves 18 and into the bore 9.

What is claimed is 1. A drill including a head having channels extending thereinto along converging lines, and concave-convex cutters mounted for 'rotation Within the channels and having their concave faces outermost.

2. A drill including a head having con` cavo-convex side cutters revolulole in planes converging into the head, the concave faces of the cutters being outermost;

3. A drill including a head having iuwardly converging channels in its active end, inwardly converging concave-convex cutters mounted for rotation within the respective-channels and having their concave faces outermost and fitted close to the outer walls. of the channels in which they are mounted,` said cutters projecting beyond the isov being inwardly converging channels Within said end and at opposite sides of the recess, a concave-convex disk mounted for rotation Within each of the channels, said disk having its concave face outermost and its cutting edge disposed close to the outer Wall of the channel and projecting beyond the active end and the periphery of the head, a tubular bearing shaft disposed longitudinally Within the recess and held against rotation, said shaft having inlets adjacent its ends and a plurality of outlets, means for directing a lubricant to said inlets, a plurality of concavo-conveX cutters carried by the shaft and Within the recess, said cutters extending beyond the active end of the head, each cutter including a hub, and a circular flange extending from one end of the hub, the other end of the hub being formed with a recess, a plurality of cylindrical bushings mounted on the shaft, each bushing having a concentric sleeve around one end portion thereof to form an annular recess, there being an annular flange upon the sleeve, the flange on each hub being adapted to be seated in the recess in one bushing and said bushing with the flange therein being adapted to be seated in the recess in one of the hubs, the annular flanges on the bushing constituting means for spacing the hubs.

5. A bit including a head having channels extending into the active end thereof, and a cutting element mounted for rotation Within each channel and projecting beyond the active end of the bit, said element including a concave-convex disk having outwardly diverging peripheral tongues.

In testimony that I claim the foregoing as my own, I have hereto afiiXed my signature in the presence of tWo Witnesses.

GRANVILLE A. HUMASON.

Witnesses:

SELINA WILLsoN, JOHN L. KIMBELL. 

